def test_start_stop_multiple(pyocf_ctx):
"""Starting/stopping multiple caches.
Check whether OCF allows for starting multiple caches and stopping them in random order
"""
caches = []
caches_no = randrange(6, 11)
for i in range(1, caches_no):
cache_device = Volume(Size.from_MiB(20))
cache_name = f"cache{i}"
cache_mode = CacheMode(randrange(0, len(CacheMode)))
size = 4096 * 2**randrange(0, len(CacheLineSize))
cache_line_size = CacheLineSize(size)
cache = Cache.start_on_device(
cache_device,
name=cache_name,
cache_mode=cache_mode,
cache_line_size=cache_line_size)
caches.append(cache)
stats = cache.get_stats()
assert stats["conf"]["cache_mode"] == cache_mode, "Cache mode"
assert stats["conf"]["cache_line_size"] == cache_line_size, "Cache line size"
assert stats["conf"]["cache_name"] == cache_name, "Cache name"
caches.sort(key=lambda e: randrange(1000))
for cache in caches:
logger.info("Getting stats before stopping cache")
stats = cache.get_stats()
cache_name = stats["conf"]["cache_name"]
cache.stop()
assert get_cache_by_name(pyocf_ctx, cache_name) != 0, "Try getting cache after stopping it"
def test_start_stop_incrementally(pyocf_ctx):
"""Starting/stopping multiple caches incrementally.
Check whether OCF behaves correctly when few caches at a time are
in turns added and removed (#added > #removed) until their number reaches limit,
and then proportions are reversed and number of caches gradually falls to 0.
"""
counter = count()
caches = []
caches_limit = 10
add = True
run = True
increase = True
while run:
if add:
for i in range(0,
randrange(3, 5) if increase else randrange(1, 3)):
cache_device = Volume(Size.from_MiB(20))
cache_name = f"cache{next(counter)}"
cache_mode = CacheMode(randrange(0, len(CacheMode)))
size = 4096 * 2**randrange(0, len(CacheLineSize))
cache_line_size = CacheLineSize(size)
cache = Cache.start_on_device(cache_device,
name=cache_name,
cache_mode=cache_mode,
cache_line_size=cache_line_size)
caches.append(cache)
stats = cache.get_stats()
assert stats["conf"]["cache_mode"] == cache_mode, "Cache mode"
assert stats["conf"][
"cache_line_size"] == cache_line_size, "Cache line size"
assert stats["conf"]["cache_name"] == cache_name, "Cache name"
if len(caches) == caches_limit:
increase = False
else:
for i in range(0,
randrange(1, 3) if increase else randrange(3, 5)):
if len(caches) == 0:
run = False
break
cache = caches.pop()
logger.info("Getting stats before stopping cache")
stats = cache.get_stats()
cache_name = stats["conf"]["cache_name"]
cache.stop()
assert get_cache_by_name(pyocf_ctx, cache_name) != 0, \
"Try getting cache after stopping it"
add = not add
def test_100_start_stop(pyocf_ctx):
"""Starting/stopping stress test.
Check OCF behaviour when cache is started and stopped continuously
"""
for i in range(1, 101):
cache_device = Volume(Size.from_MiB(20))
cache_mode = CacheMode(randrange(0, len(CacheMode)))
size = 4096 * 2**randrange(0, len(CacheLineSize))
cache_line_size = CacheLineSize(size)
cache = Cache.start_on_device(
cache_device,
cache_mode=cache_mode,
cache_line_size=cache_line_size)
stats = cache.get_stats()
assert stats["conf"]["cache_mode"] == cache_mode, "Cache mode"
assert stats["conf"]["cache_line_size"] == cache_line_size, "Cache line size"
assert stats["conf"]["cache_id"] == 1, "Cache id"
cache.stop()
assert get_cache_by_id(pyocf_ctx, 1) != 0, "Try getting cache after stopping it"